SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f470964475d30826ea3b516d7bd09f3e5c8248dd14dfd15e34e7ef3e354e6f' 
  AND token = 'x7KZvWubthJ4G8zqHnaPrt7gPK8I4giaJqlG/wt9iz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}